Shenzhen, referred to as Pengcheng for short, is a sub-provincial city, a city with separate plans and a megacity under the jurisdiction of Guangdong Province. It is also a China Special Economic Zone, a national economic center city and an international city approved by the State Council. As of 20 18, there are nine districts in the city, with a total area of 1997.47 square kilometers, built-up area of 9.27.96 square kilometers, permanent population of1302.66 million, urban population of1302.66 million, and urbanization rate of10. It's China. Shenzhen is located in South China, South Guangdong and the east bank of the Pearl River Estuary, bordering Daya Bay and Mirs Bay in the east, the Pearl River Estuary and Lingdingyang in the west and Hong Kong across the Shenzhen River in the south. It is also one of the four central cities in Guangdong-Hong Kong-Macao Greater Bay Area, an international comprehensive transportation hub, an international science and technology industry innovation center and one of the three national financial centers in China. It is making every effort to build a global ocean centre city, a pioneering demonstration zone in Socialism with Chinese characteristics and a comprehensive national science center. Shenzhen is a port city with the largest number of ports, the largest number of entry-exit personnel and the largest traffic flow in China.